CALIBRE

In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires, in hundredths or sometimes thousandths of an inch. For example, a "45 caliber" firearm has a barrel diameter of .45 of an inch. Wikipedia

CALIBRE

In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires, in hundredths or sometimes thousandths of an inch. For example, a "45 caliber" firearm has a barrel diameter of .45 of an inch. Wikipedia